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<TITLE>Subset Tool via Image/ROI</TITLE>
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<H2>Using "Subset LAS File(s) via Image/ROI"</H2>

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This tool is meant to subset LAS format LiDAR data using a reference image and/or regions of interest (ROIs).

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<h3>Usage:</h3>
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<li>Select the input file(s) to subset.  Multiple files can be selected if the subset area covers more than a single file.
<li>Select a reference image from the list of open files.  (If necessary, open the reference image file.) Click "OK".
<li>Click the "Spatial Subset" button.
<li>Use the ENVI subset window to define a subset area.  This can be done using the reference image, map coordinates, or a pre-determined ROI.
<li>Select the output file.  
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Back to LidarTools <a href="index.html">home page</a>.

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<h3>Notes:</h3>
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<li>This tool requires data that are in the LAS format.
<li>The subset data are saved to a single file, even if multiple input files are selected.
<li>Because the data are saved to a single file, this tool can also be used to combine multiple LAS files.  Simply leave the geographic extents as the default values.
<li>At present, this tool will <b>not</b> subset by EVF or other vector files.
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<P><A HREF="mailto:boisecal@isu.edu">Comments?</A></P>

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